juko | ace948b2106cfdf77f515a20f7e39d91be3032b50b574e836ca97899ea2e394e

General

Target
2026-05-29_1f97a5058276602d7886431c5b3ec14d_elex_wannacry.exe
Size 30KB
Sample260529-2b5lcsdt2j
SHA256 ace948b2106cfdf77f515a20f7e39d91be3032b50b574e836ca97899ea2e394e
MD5 1f97a5058276602d7886431c5b3ec14d
SHA1 8f4b880ba24c5903d17126e7ad0ed7025bd0ef30
SHA512 33d9c5a5615de3ea1ccd7da6c37f50818fc7af791b971c46db92cf64be2ad90a8a4dc173cb0f4bc56ba2e8f68cc8653f9b4057dbaddfce9fc1c47757da5cba19
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqCRNPWQH8:OLsF2Kerc64sTiX2IV0DCWD
TLSH
T10BE27D3B7EE58092C9D601F0B96D2F38C97E913A15399452CB400D4D3CF5EA6DAB1E4E
MD5 SHA1 SHA512 SSDEEP TLSH

Score

10^/10

discovery juko persistence trojan

Malware Config

Signatures

Family: Juko
Juko is a trojan written in C++.
trojan juko

Detects Juko 2 IoCs

resource	yara_rule
behavioral2/files/0x000b00000002acdd-4.dat	family_juko
behavioral2/files/0x001c00000002b514-9.dat	family_juko

Executes dropped EXE 2 IoCs

pid	Process
2112	WINWORD.exe
2380	WINWORD.exe

Adds Run key to start application 2 TTPs 1 IoCs

persistence

Registry Run Keys / Startup Folder

T1547.001

Modify Registry

T1112

description	ioc	Process
Set value (str)	\REGISTRY\USER\S-1-5-21-2654269261-3199571979-4291878722-1000\Software\Microsoft\Windows\CurrentVersion\Run\WINWORD = "C:\\Users\\Admin\\AppData\\Roaming\\Mozilla\\WINWORD.exe -r"	WINWORD.exe

Enumerates physical storage devices 1 TTPs
Attempts to interact with connected storage/optical drive(s).

System Information Discovery
T1082

System Location Discovery: System Language Discovery 1 TTPs 7 IoCs

Attempt gather information about the system language of a victim in order to infer the geographical location of that host.

discovery

System Language Discovery

T1614.001

description	ioc	Process
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	2026-05-29_1f97a5058276602d7886431c5b3ec14d_elex_wannacry.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	WINWORD.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	cmd.exe
Key opened	\REGISTRY\MACHINE\SYSTEM\ControlSet001\Control\NLS\Language	PING.EXE

System Network Configuration Discovery: Internet Connection Discovery 1 TTPs 4 IoCs

Adversaries may check for Internet connectivity on compromised systems.

discovery

Internet Connection Discovery

T1016.001

pid	Process
4132	cmd.exe
4108	PING.EXE
3608	PING.EXE
2000	PING.EXE

Runs ping.exe 1 TTPs 3 IoCs

Remote System Discovery

T1018

pid	Process
2000	PING.EXE
4108	PING.EXE
3608	PING.EXE

Suspicious use of WriteProcessMemory 6 IoCs

description	pid	Process	procid_target
PID 2876 wrote to memory of 2112	2876	2026-05-29_1f97a5058276602d7886431c5b3ec14d_elex_wannacry.exe	81
PID 2112 wrote to memory of 4132	2112	WINWORD.exe	82
PID 4132 wrote to memory of 4108	4132	cmd.exe	84
PID 4132 wrote to memory of 3608	4132	cmd.exe	85
PID 4132 wrote to memory of 2000	4132	cmd.exe	86
PID 4132 wrote to memory of 2380	4132	cmd.exe	87

C:\Users\Admin\AppData\Local\Temp\2026-05-29_1f97a5058276602d7886431c5b3ec14d_elex_wannacry.exe
"C:\Users\Admin\AppData\Local\Temp\2026-05-29_1f97a5058276602d7886431c5b3ec14d_elex_wannacry.exe"
1⤵
- System Location Discovery: System Language Discovery
- Suspicious use of WriteProcessMemory
PID:2876
- C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
  "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" -r
  2⤵
  - Executes dropped EXE
  - System Location Discovery: System Language Discovery
  - Suspicious use of WriteProcessMemory
  PID:2112
- - C:\Windows\SysWOW64\cmd.exe
    "C:\Windows\System32\cmd.exe" /c ping 127.0.0.1 -n 2&del "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe"&ping 127.0.0.1 -n 2&rename "C:\Users\Admin\AppData\Roaming\Mozilla\00007D21" WINWORD.exe&ping 127.0.0.1 -n 2&"C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
    3⤵
    - System Location Discovery: System Language Discovery
    - System Network Configuration Discovery: Internet Connection Discovery
    - Suspicious use of WriteProcessMemory
    PID:4132
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:4108
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:3608
  - - C:\Windows\SysWOW64\PING.EXE
      ping 127.0.0.1 -n 2
      4⤵
      System Location Discovery: System Language Discovery
      System Network Configuration Discovery: Internet Connection Discovery
      Runs ping.exe
      PID:2000
  - - C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
      "C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe" \r
      4⤵
      Executes dropped EXE
      Adds Run key to start application
      System Location Discovery: System Language Discovery
      PID:2380

Network

MITRE ATT&CK Enterprise v16

Reconnaissance

Resource Development

Initial Access

Execution

Persistence

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Privilege Escalation

Boot or Logon Autostart Execution

1

T1547

Registry Run Keys / Startup Folder

1

T1547.001

Defense Evasion

Modify Registry

1

T1112

Credential Access

Discovery

Remote System Discovery

1

T1018

System Information Discovery

1

T1082

System Location Discovery

1

T1614

System Language Discovery

1

T1614.001

System Network Configuration Discovery

1

T1016

Internet Connection Discovery

1

T1016.001

Lateral Movement

Collection

Command and Control

Exfiltration

Impact

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Downloads

00007D21

Path C:\Users\Admin\AppData\Roaming\Mozilla\00007D21
Size 30KB
SHA256 ddbfae303931206506270257d056fffecf8c4ac1628586b079d727711e525010
MD5 ad9adca67d6c95545cdabfc73d3ca351
SHA1 8bcd6355da21a5eb46e49bdaef525d0e1f8881a1
SHA512 d7434acbd9ad32b1a9cadcb0b7ae4e94d71fb78e4fc15bb78b089bf3e9926a09941d81d3c79adce699480fb24fbe93bc2200162136cd8d98b09763920eff6fd9
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqCRNPWQH1:OLsF2Kerc64sTiX2IV0DCWu
TLSH
T18CE27D3B7EE58092C9D601F0B96D2F38C97E913A15399452CB400D4D3CF5EA6DAB1E4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

WINWORD.exe

Path C:\Users\Admin\AppData\Roaming\Mozilla\WINWORD.exe
Size 30KB
SHA256 ace948b2106cfdf77f515a20f7e39d91be3032b50b574e836ca97899ea2e394e
MD5 1f97a5058276602d7886431c5b3ec14d
SHA1 8f4b880ba24c5903d17126e7ad0ed7025bd0ef30
SHA512 33d9c5a5615de3ea1ccd7da6c37f50818fc7af791b971c46db92cf64be2ad90a8a4dc173cb0f4bc56ba2e8f68cc8653f9b4057dbaddfce9fc1c47757da5cba19
SSDEEP 768:qZL/0F24lercjO4sTZg5ZLvn2IuWZ0kqCRNPWQH8:OLsF2Kerc64sTiX2IV0DCWD
TLSH
T10BE27D3B7EE58092C9D601F0B96D2F38C97E913A15399452CB400D4D3CF5EA6DAB1E4E
MD5 SHA1 SHA512 SSDEEP TLSH

Submit Download

Analysis

Sharing

General

Malware Config

Signatures

Processes

Network

MITRE ATT&CK Enterprise v16

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Downloads